In article <O_BEj.14454$jH5.8429@[EMAIL PROTECTED]
>,
Martin <martin.wilkins50@[EMAIL PROTECTED]
> wrote:
> How do you solve this problem
>
> If Sally can paint a house in 4 hours, and John can paint the same house
> in 6 hour, how long will it take for both of them to paint the house
> together?
>
> 2 hours and 24 minutes
> 3 hours and 12 minutes
> 3 hours and 44 minutes
> 4 hours and 10 minutes
> 4 hours and 33 minutes
>
> Apparently it's 2 hours and 24 minutes
If it's a multiple-guess test then you don't even need an equation, just
some rough approximation skills:
* If John were faster, as fast as Sally, it would take 2 hours.
* If Sally were slower, as slow as John, it would take 3 hours.
* Thus the answer is somewhere between 2 and 3 hours, and only one of
the candidate answers qualifies.
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